Diagnosis
Laboratory tests may reveal an increased sedimentation rate, elevated CRP, anemia and elevated creatinine due to renal impairment. An important diagnostic test is the presence of perinuclear antineutrophil cytoplasmic antibodies (p-ANCA) with myeloperoxidase specificity (a constituent of neutrophil granules), and protein and red blood cells in the urine.
In patients with neuropathy, an EMG may reveal a sensorimotor peripheral neuropathy.
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